A heat exchanger

Abstract

The present application discloses a heat exchanger, comprising a heat exchange plate, the heat exchange plate comprising a substrate, a first protrusion and a second protrusion, the first protrusion and the second protrusion both protruding in a first direction, a first groove and a second groove formed on the back surfaces of the first protrusion and the second protrusion, the maximum width of the orthographic projection of the first groove on the plane where the second side surface of the substrate is located is λ1, the maximum width of the orthographic projection of the second groove on the plane where the second side surface of the substrate is located is λ2, the depth of the first groove relative to the second side surface of the substrate is Dp1, the depth of the second groove relative to the second side surface of the substrate is Dp2, the thickness of the top of the protrusion of the first protrusion is h1, and the thickness of the top of the protrusion of the second protrusion is h2, wherein, -0.05mm≤(h1+Dp1)-(h2+Dp2)≤0.05mm, and Dp1>Dp2, λ1<λ2, thereby reducing the height difference between the top of the first protrusion and the top of the second protrusion.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchanger. Background Art

[0002] The heat exchanger in the related art includes multiple heat exchange plates arranged in a stacked arrangement. The heat exchange plates are provided with protrusions to increase the contact area between the heat exchange plates and the heat exchange fluid and to disturb the heat exchange fluid to improve heat exchange performance. For compact plate heat exchangers, especially for applications such as automobiles and high-efficiency refrigeration equipment, the flow channel size of the heat exchanger is significantly reduced, from the traditional 3-5mm hydraulic diameter to a hydraulic diameter level below 3mm, or even below 2mm. In such scenarios, higher requirements are placed on the manufacturing precision of the heat exchange plates. In particular, the plate mold and stamping technology, brazing technology, etc., are significantly more technically difficult than related applications in traditional industries. Heat exchange plates are usually manufactured using full-contour mold technology, that is, the mold is completely contoured to the heat exchange plate structure. When a heat exchange plate is provided with two or more protrusions of different structures at the same time, it is easy to cause the top heights of some protrusions to be different. The lower the top height of the protrusion, the more likely it is to cause cold welds, which ultimately affects the heat exchange performance and reliability of the product. Summary of the Invention

[0003] The purpose of the present application is to provide a heat exchanger, which reduces the height difference of the raised tops of the heat exchange plates and reduces the cold welding of the heat exchanger.

[0004] An embodiment of the present application provides a heat exchanger, comprising a plurality of stacked heat exchange plates, the heat exchange plates comprising a base plate, a first protrusion, and a second protrusion, wherein a direction perpendicular to the base plate is defined as a first direction, the first protrusion and the second protrusion both protrude toward the first direction, a first groove is formed on the back surface of the first protrusion, and a second groove is formed on the back surface of the second protrusion, the base plate comprising two side surfaces, a side surface facing the first direction is defined as a first side surface, and a side surface facing away from the first direction is defined as a second side surface;

[0005] The maximum width of the orthographic projection of the first groove on the plane where the second side surface of the substrate is located is defined as λ1, the maximum width of the orthographic projection of the second groove on the plane where the second side surface of the substrate is located is defined as λ2, the depth of the first groove relative to the second side surface of the substrate is defined as Dp1, the depth of the second groove relative to the second side surface of the substrate is defined as Dp2, the thickness of the top of the first protrusion is defined as h1, and the thickness of the top of the second protrusion is defined as h2, wherein, -0.05mm≤(h1+Dp1)-(h2+Dp2)≤0.05mm, and, Dp1>Dp2, λ1<λ2.

[0006] When a heat exchange plate has a first protrusion and a second protrusion, a first groove is formed on the back side of the first protrusion, and a second groove is formed on the back side of the second protrusion. When -0.05mm≤(h1+Dp1)-(h2+Dp2)≤0.05mm, and Dp1>Dp2, and λ1<λ2, due to λ1<λ2, the deformation of the heat exchange plate in the area where the first protrusion is located is greater than the deformation of the heat exchange plate in the area where the second protrusion is located, which easily leads to a greater degree of material thinning at the top of the first protrusion than at the top of the second protrusion, that is, the thickness of the top of the first protrusion is less than the thickness of the top of the second protrusion, which easily leads to the top of the first protrusion being lower than the top of the second protrusion. By increasing the depth Dp1 of the first groove, that is, the depth Dp1 of the first groove is greater than the depth Dp2 of the second groove, the thinning of the top of the first protrusion is compensated by the depth of the first groove, the height difference between the top of the first protrusion and the top of the second protrusion is reduced, and the cold welds of the heat exchanger are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of a three-dimensional structure of the heat exchanger of the present application;

[0008] Figure 2 This is a structural diagram of the heat exchange plate of this application;

[0009] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at B in the middle;

[0010] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure at C in the middle;

[0011] Figure 5 yes Figure 2 Schematic diagram of the cross-sectional structure in the AA direction;

[0012] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure at D in the middle;

[0013] Figure 7 is an enlarged structural comparison diagram of the first protrusion and the second protrusion;

[0014] Figure 8 This is another structural diagram of the heat exchange plate of this application;

[0015] Figure 9 yes Figure 8 Schematic diagram of the enlarged structure at E in the middle;

[0016] Figure 10 yes Figure 8 Schematic diagram of the enlarged structure at F in the middle;

[0017] Figure 11This is another cross-sectional structural diagram of the heat exchange plate of the present application;

[0018] Figure 12 yes Figure 11 Schematic diagram of the enlarged structure at G in the middle;

[0019] Figure 13 is an enlarged structural comparison diagram of the first protrusion and the second protrusion;

[0020] Figure 14 This is another partial structural diagram of the heat exchange plate of this application;

[0021] Figure 15 This is a reference diagram for the distribution of the heat exchange area and corner hole area of the heat exchange plate of this application;

[0022] Figure 16 This is another partial structural diagram of the heat exchange plate of this application. DETAILED DESCRIPTION

[0023] See also Figure 1-16 , an embodiment of the present application provides a heat exchanger 1, comprising a plurality of heat exchange plates 10 stacked, a fluid channel is provided between adjacent heat exchange plates 10, and other components such as fins can be provided in the fluid channel, the heat exchanger 1 is further provided with a pipe 20 communicating with the fluid channel, the heat exchange plate 10 comprises a base plate 11, a first protrusion 12 and a second protrusion 13, a direction perpendicular to the base plate 11 is a first direction, and the first direction is Figure 1 、 Figure 5 、 Figure 8 In the direction N, the first protrusion 12 and the second protrusion 13 protrude in the same direction, both protruding in the first direction N. The substrate 11 includes a first side surface 111 close to the first protrusion 12 and the second protrusion 13 and a second side surface 112 away from the first protrusion 12 and the second protrusion 13. A first groove 14 is formed on the back side of the first protrusion 12, and a second groove 15 is formed on the back side of the second protrusion 13. The maximum width of the orthographic projection of the first groove 14 on the plane where the second side surface 112 of the substrate 11 is located is λ1, and the maximum width of the orthographic projection of the second groove 15 on the plane where the second side surface 112 of the substrate 11 is located is λ2. The depth of the first groove 14 relative to the second side surface 112 of the substrate 11 is Dp1, and the depth of the second groove 15 relative to the second side surface 112 of the substrate 11 is Dp2, wherein λ1 / Dp1<λ2 / Dp2, and Dp1>Dp2.

[0024] When the heat exchange plate 10 has two or more different protrusions, that is, the heat exchange plate 10 has at least a first protrusion 12 and a second protrusion 13, and the first protrusion 12 and the second protrusion 13 satisfy λ1 / Dp1<λ2 / Dp2, at this time, the maximum width of the orthographic projection of the first groove 14 on the back side of the first protrusion 12 on the plane where the second side surface 112 of the substrate 11 is located is smaller than the maximum width of the orthographic projection of the second groove 15 on the back side of the second protrusion 13 on the plane where the second side surface 112 of the substrate 11 is located, that is, λ1<λ2, and the depth of the first groove 14 relative to the second side surface 112 of the substrate 11 is greater than the depth of the second groove 15 relative to the second side surface 112 of the substrate 11. When processing the protrusions of the heat exchange plate 10, due to λ1<λ2, the deformation of the heat exchange plate 10 in the area where the first protrusion 12 is located is greater than the deformation of the heat exchange plate 10 in the area where the second protrusion 13 is located, which easily leads to a larger degree of material thinning at the top of the first protrusion 12 than at the top of the second protrusion 13, that is, the thickness of the top of the first protrusion 12 is less than the thickness of the top of the second protrusion 13, which easily leads to the top of the first protrusion 12 being lower than the top of the second protrusion 13. By increasing the depth Dp1 of the first groove 14, that is, the depth Dp1 of the first groove 14 is greater than the depth Dp2 of the second groove 15, the thinning amount of the top of the first protrusion 12 is compensated by the depth of the first groove 14, and the height difference between the top of the first protrusion 12 and the top of the second protrusion 13 is reduced, thereby reducing the cold welding of the heat exchanger 1. In addition, this parameter relationship between the first protrusion 12 and the second protrusion 13 enables the heat exchanger 1 to have a more superior heat exchange performance, but in manufacturing, it is also necessary to design it in combination with the structural molding characteristics of the heat exchange plate 10, and convert the differences in material molding into a structure of the heat exchange plate 10 that is beneficial to the heat exchange performance, while conforming to the heat exchange requirements and manufacturing characteristics of the heat exchanger 1.

[0025] The base plate refers to the portion of the heat exchange plate without protrusions or grooves, which can be the flat portion around the corner holes of the heat exchange plate, or the flat portion between adjacent protrusions or grooves.

[0026] In some embodiments, as Figure 2-15 As shown, the first protrusion 12 is located in the middle of the length direction of the heat exchange plate 10, and the second protrusion 13 is close to the end of the length direction of the heat exchange plate 10. Specifically, as shown in FIG. Figure 15As shown, the heat exchange plate 10 includes a first corner hole area 40, a second corner hole area 50 and a heat exchange area 60. Along the length direction of the heat exchange plate 10, the heat exchange plate 10 includes a first end and a second end. The first corner hole area 40 is close to the first end of the heat exchange plate 10, and the second corner hole area 50 is close to the second end of the heat exchange plate 10. The heat exchange area 60 is located between the first corner hole area 40 and the second corner hole area 50. The first protrusion 12 is provided in the heat exchange area 60, and the second protrusion 13 is provided in the first corner hole area 40 and / or the second corner hole area 50. The first protrusion 12 is provided in the heat exchange area 60. Since λ1 / Dp1<λ2 / Dp2, and Dp1>Dp2, through the superior material stretching molding design, more heat exchange area and more delicate heat exchange space and protrusion structure are provided, that is, λ1<λ2, giving priority to ensuring the heat exchange performance of the heat exchange zone 60. On the other hand, the second protrusion 13 is arranged in the first corner hole area 40 and / or the second corner hole area 50 to meet the distribution of the fluid in the first corner hole area 40 and the second corner hole area 50, and ensure the wall thickness of the fluid channel in this area and the strength of the post-weld structure.

[0027] In some specific embodiments, Figure 8 、 Figure 15 As shown, the first corner hole area 40 and the second corner hole area 50 are provided with a plurality of corner holes 30, wherein, along the width direction of the heat exchange plate 10, the first corner hole area 40 is provided with a first corner hole 31 and a second corner hole 32, and the second corner hole area 50 is provided with a third corner hole 33 and a fourth corner hole 34, wherein the first corner hole 31 and the third corner hole 33 are located on the same side of the heat exchange plate 10, and the second corner hole 32 and the fourth corner hole 34 are located on the other side of the heat exchange plate 10, a second protrusion 13 is provided between the first corner hole 31 and the second corner hole 32, and a second protrusion 13 is provided between the third corner hole 33 and the fourth corner hole 34, wherein the second protrusion 13 can be provided only in one of the corner hole areas, or the second protrusion 13 can be provided in both corner hole areas. In addition, as Figure 2 、 Figure 8 As shown, a first guide area 70 can be set between the first corner hole area 40 and the heat exchange area 60, and a second guide area 80 can be set between the second corner hole area 50 and the heat exchange area 60. The second protrusion 13 is provided in the first guide area 70 and / or the second guide area 80 to ensure the distribution of the fluid. Of course, the heat exchange plate 10 may also not be provided with a guide area, and the second protrusion 13 may be located only in the corner hole area.

[0028] like Figure 8As shown, the heat exchange plate 10 is further provided with a plurality of protrusions 19 protruding toward the first direction, and the protrusions 19 are arranged around the edges of the first corner hole 31 and the third corner hole 33, and the first corner hole 31 and the third corner hole 33 are located at the top of the protrusion 19. In addition, the protrusion 19 can also be arranged at other positions, for example, the protrusion 19 is located at the outer periphery of the second corner hole 32 and the fourth corner hole 34, and there is a predetermined distance between the protrusion 19 and the second corner hole 32 and the fourth corner hole 34, respectively. The back side of the protrusion top of the first protrusion 12 has a first flat portion 141, the back side of the protrusion top of the second protrusion 13 has a second flat portion 151, and the back side of the top of the protrusion 19 has a third flat portion 191, as shown in FIG. Figure 5 As shown, the width of the first flat portion 141 is Wb1, and the width of the second flat portion 151 is Wb2. Figure 11 As shown, the width of the third flat portion 191 is Wb3, and the width Wb1 of the first flat portion 141, the width Wb2 of the second flat portion 151, and the width Wb3 of the third flat portion 191 satisfy: Wb1≤Wb2<Wb3. Here, the width Wb1 of the first flat portion 141, the width Wb2 of the second flat portion 151, and the width Wb3 of the third flat portion 191 do not include the chamfered portion. By adjusting the width relationship between the first flat portion 141, the second flat portion 151, and the third flat portion 191, the width of the third flat portion 191 is increased to ensure the strength of the heat exchange plate 10, and the widths of the first flat portion 141 and the second flat portion 151 are decreased to ensure the heat exchange effect in the corresponding areas. Specifically, Wb1 is preferably not greater than 1.5 mm, and Wb3 is preferably not less than 2 mm. By providing the flat portions, the contact area between the heat exchange plates 10 or between the heat exchange plates 10 and the fins is increased, thereby improving the overall strength of the heat exchanger 1.

[0029] Of course, the first corner hole 31 and the fourth corner hole 34 can be located on the same side of the heat exchange plate 10, and the second corner hole 32 and the third corner hole 33 can be located on the other side of the heat exchange plate 10 to achieve diagonal flow of the heat exchange fluid, that is, the inlet and outlet of the fluid channel are located on different sides of the heat exchange plate.

[0030] In some specific embodiments, the first protrusion 12 may be a corrugated protrusion, and a plurality of corrugated protrusions are arranged along the length direction of the heat exchange plate 10, and a groove 18 is formed between two adjacent corrugated protrusions. Specifically, Figure 2As shown, the first protrusion 12 is a single herringbone wave. The single herringbone wave means that the first protrusion 12 includes two extension sections 121 set at an angle. Each extension section 121 is inclined relative to the length direction of the heat exchange plate 10. The two extension sections 121 can be symmetrically set along the width direction of the heat exchange plate 10 or asymmetrically set. Some extension sections 121 can also extend along the length direction of the heat exchange plate 10. A first groove 181 is formed between adjacent corrugated protrusions, some of the second protrusions 13 are corrugated protrusions, and some of the second protrusions 13 are long strip protrusions.

[0031] In some embodiments, as Figures 8-15 As shown, the first protrusion 12 is a corrugated protrusion. Specifically, the first protrusion 12 is a multiple herringbone wave. The multiple herringbone wave means that the first protrusion 12 includes multiple extension sections 121 arranged at an angle. Each extension section 121 is inclined relative to the length direction of the heat exchange plate 10. The number of extension sections 121 is greater than two. Figure 11 、 Figure 12 As shown, a third protrusion 16 protruding toward the first direction is provided between at least some adjacent two first protrusions 12, and a third groove 161 is formed on the back side of the third protrusion 16. The height of the third protrusion 16 relative to the first side surface 111 of the substrate 11 is less than the height of the first protrusion 12 relative to the first side surface 111 of the substrate 11. A second groove 182 is provided between adjacent first protrusions 12 and third protrusions 16. Through the arrangement of the third protrusion 16, an asymmetric structure of the heat exchange plate 10 is realized, that is, adjacent fluid channels have different flow areas, and different turbulence effects of the fluid channels are realized, and the heat exchange performance of the heat exchanger is improved through a more complex protrusion structure.

[0032] Of course, the asymmetric structure of the heat exchange plate can also adopt other structures, such as Figure 9 、 Figure 14 As shown, a fourth groove 171 recessed away from the first direction is provided between at least some adjacent two first protrusions 12, and a fourth protrusion 17 is formed on the back of the fourth groove 171. The height of the first protrusion 12 relative to the first side surface 111 of the substrate 11 is greater than the height of the fourth protrusion 17 relative to the second side surface 112 of the substrate 11. The first protrusion 12 is a corrugated protrusion, and multiple corrugated protrusions are arranged along the length direction of the heat exchange plate 10. The corrugated protrusion includes multiple extension sections 121, and the extension sections 121 are inclined relative to the length direction of the heat exchange plate 10. The fourth protrusion 17 is a corrugated protrusion and is located between two adjacent first grooves 14.

[0033] It is understandable that the first protrusion 12 may be a corrugated protrusion or other structures such as a dot wave. Figure 16As shown, the dot wave refers to a concave structure formed on the back of the first protrusion 12. The structure of the first protrusion 12 corresponds to the structure of the concave structure, such as a circular protrusion or a polygonal pyramidal protrusion. The heat exchange plate 10 is also provided with a concave portion 113, and multiple first protrusions 12 are arranged around the concave portion 113. The second protrusion 13 can also adopt other structures. In addition to being closer to the ends of the heat exchange plate 10 relative to the first protrusion 12, the first and second protrusions 12, 13 can also be provided on both sides of the heat exchange plate 10 in the width direction, or at both ends in the length direction, etc. The distribution of the first and second protrusions 12, 13 can be adjusted according to the specific application requirements of the heat exchange plate 10.

[0034] like Figure 6 、 Figure 7 As shown, the thickness of the base plate 11 of the heat exchange plate 10 is H, the depth of the first groove 14 relative to the second side surface of the base plate 11 is Dp1, and the depth of the second groove 15 relative to the second side surface of the base plate 11 is Dp2. The depth Dp1 of the first groove 14 relative to the second side surface of the base plate 11, the depth Dp2 of the second groove 15 relative to the second side surface of the base plate 11, and the thickness H of the base plate 11 satisfy: Dp2<Dp1<Dp2+2.8H. Specifically, the thickness H of the base plate 11 can be 0.2-0.8 mm, and the depth Dp1 of the first groove 14 can be 0. 9mm, the depth Dp2 of the second groove 15 can be 0.85mm. Since the thickness of the heat exchange plate 10 directly affects the degree of material thinning at the top of the protrusion, Dp2 is controlled to be less than Dp1 and less than Dp2+2.8H, so as to reasonably adjust the depths of the first groove 14 and the second groove 15 according to the thickness of the heat exchange plate 10, thereby reducing the height difference between the top of the first protrusion 12 and the top of the second protrusion 13, and improving the flatness of the heat exchange plate 10. The flatness here means that the tops of the protrusions of the heat exchange plate 10 are at the same height as much as possible, and the height difference is controlled within a reasonable range.

[0035] In some specific embodiments, Figure 6 、 Figure 7 and Figure 12 、 Figure 13As shown, the maximum width λ1 of the orthographic projection of the first groove 14 on the plane where the second side surface 112 of the substrate 11 is located, the maximum width λ2 of the orthographic projection of the second groove 15 on the plane where the second side surface 112 of the substrate 11 is located, and the depth Dp1 of the first groove 14 relative to the second side surface 112 of the substrate 11 and the depth Dp2 of the second groove 15 relative to the second side surface 112 of the substrate 11 satisfy: 0.2≤(λ1•Dp2) / (λ2•Dp1) ≤0.9. Since the maximum width of the orthographic projection of the groove on the plane where the second side surface 112 of the substrate 11 is located directly affects the degree of material thinning at the top of the protrusion, the smaller the maximum width of the orthographic projection of the groove on the plane where the second side surface 112 of the substrate 11 is located, the greater the deformation of the heat exchange plate 10 in the area where the groove is located, and the greater the degree of material thinning at the top of the protrusion. Since Dp1>Dp2, it can be seen that λ1<λ2, the deformation of the heat exchange plate 10 in the area where the first groove 14 is located is greater than the deformation of the heat exchange plate 10 in the area where the second groove 15 is located, and 0.2≤(λ1•Dp2) / (λ2•Dp1) ≤0.9 is controlled. Therefore, according to the maximum width of the orthographic projection of the first groove 14 and the second groove 15 on the plane where the second side surface 112 of the substrate 11 is located, the corresponding relationship between the depth of the first groove 14 and the depth of the second groove 15 is adjusted, thereby reducing the height difference between the top of the first protrusion 12 and the top of the second protrusion 13.

[0036] In some specific embodiments, the heat exchange plate 10 is made of an aluminum alloy plate, the thickness H of the substrate 11 is generally about 0.4-0.5 mm, the maximum width λ1 of the orthographic projection of the first groove 14 on the plane where the second side surface 112 of the substrate 11 is located and the depth Dp1 of the first groove 14 relative to the second side surface 112 of the substrate 11 satisfy: 2.5≤λ1 / Dp1≤5, the maximum width λ2 of the orthographic projection of the second groove 15 on the plane where the second side surface 112 of the substrate 11 is located and the depth Dp2 of the second groove 15 relative to the second side surface 112 of the substrate 11 satisfy: 3.5≤λ2 / Dp2≤7, so that the area where the first protrusion 12 is located has good heat exchange performance, and the top of the second protrusion 13 has sufficient thickness to ensure the strength of the heat exchange plate 10. Specifically, on the one hand, the first protrusion 12 meets the technical requirement of 2.5≤λ1 / Dp1≤5, prioritizing the product's heat exchange performance in the corresponding area. For example, placing the first protrusion 12 in the heat exchange zone 60 prioritizes the heat exchange performance of the heat exchange zone 60. This means that the first protrusion 12 achieves superior material stretching design, providing more heat exchange area and a more detailed heat exchange space and structure. On the other hand, the second protrusion 13 meets the technical requirement of 3.5≤λ2 / Dp2≤7, balancing the product's heat exchange performance and reliability in the corresponding area. For example, the second protrusion 13 is placed in the corner hole area or the guide area between the corner hole area and the heat exchange area. Through appropriate material stretching, while meeting the flow and heat exchange requirements of the corresponding area, the wall thickness of the fluid channel and the strength of the post-weld structure are ensured. Furthermore, within the overall product structure and function, fluid distribution is prioritized in such areas, and the technical requirement of 3.5≤λ2 / Dp2≤7 is also beneficial in this regard.

[0037] By providing the first and second protrusions 12, 13 on the heat exchange plate 10 and ensuring that the first and second protrusions 12, 13 conform to the aforementioned parameter relationship, the heat exchanger 1 achieves superior heat exchange performance and a reliable structure. On the one hand, in the heat exchange region 60, the fluid channel corresponding to the second side surface of the substrate 11 will have a denser and more uniform solder joint arrangement, enhancing the heat exchange effect and improving the structure of the fluid channel, making it particularly suitable for applications primarily using refrigerants. The first and second protrusions 12, 13 conforming to the aforementioned parameter relationship will further facilitate uniform material forming. Logically, superior heat exchange performance requires greater material thinning. This requires ensuring uniform forming of the heat exchange plate 10 during processing, minimizing the difference in maximum thinning between different areas, and eliminating local "shortcomings" in the product structure. This application, after effectively exploring the product's heat exchange performance and material forming characteristics, seeks to identify "commonly beneficial areas" for heat exchange performance and product strength, while meeting technical requirements. On the other hand, the two ends of the heat exchange plate 10 are key positions for the strength and distribution of the heat exchanger 1. The corner hole area of the present application prioritizes strength and distribution, while taking into account superior heat exchange performance and reliable product structure.

[0038] In some embodiments, as Figure 7 、 Figure 13 As shown, the thickness of the top of the first protrusion 12 is h1, the thickness of the top of the second protrusion 13 is h2, the depth Dp1 of the first groove 14 relative to the second side surface 112 of the substrate 11, the depth Dp2 of the second groove 15 relative to the second side surface 112 of the substrate 11, the thickness h1 of the top of the first protrusion 12, and the thickness h2 of the top of the second protrusion 13 satisfy: -0.05mm≤(h1+ Dp1)-(h2+ Dp2) ≤ 0.05mm, so that the top of the first protrusion 12 and the top of the second protrusion 13 are basically at the same height, that is, the top of the first protrusion 12 and the top of the second protrusion 13 are basically in the same plane, so as to avoid the cold welding of the heat exchanger due to the height of some protrusion tops being too low, wherein, the height of the top of the first protrusion 12 and the top of the second protrusion 13 is controlled not to exceed 0.05mm, and the cold welding of the heat exchanger can be easily avoided by solder filling and the like, thereby improving the overall performance of the heat exchanger. Specifically, the thickness h1 of the protrusion top of the first protrusion 12 can be 0.4mm, and the thickness h2 of the protrusion top of the second protrusion 13 can be 0.45mm-0.5mm. At this time, λ1<λ2, the depth Dp1 of the first groove 14 relative to the second side surface 112 of the substrate 11 can be 0.9mm, and the depth Dp2 of the second groove 15 relative to the second side surface 112 of the substrate 11 can be 0.85mm-0.9mm.

[0039] The heat exchanger provided by the present invention has been described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A heat exchanger comprising a plurality of stacked heat exchange plates, characterized in that: The heat exchange plate includes a base plate, a first protrusion and a second protrusion, a direction perpendicular to the base plate is defined as a first direction, the first protrusion and the second protrusion both protrude toward the first direction, a first groove is formed on the back side of the first protrusion, and a second groove is formed on the back side of the second protrusion, the base plate includes two side surfaces, a side surface facing the first direction is defined as a first side surface, and a side surface away from the first direction is defined as a second side surface; The maximum width of the orthographic projection of the first groove on the plane where the second side surface of the substrate is located is defined as λ1, the maximum width of the orthographic projection of the second groove on the plane where the second side surface of the substrate is located is defined as λ2, the depth of the first groove relative to the second side surface of the substrate is defined as Dp1, the depth of the second groove relative to the second side surface of the substrate is defined as Dp2, the thickness of the top of the first protrusion is defined as h1, and the thickness of the top of the second protrusion is defined as h2, wherein, -0.05mm≤(h1+Dp1)-(h2+Dp2)≤0.05mm, and, Dp1>Dp2, λ1<λ2.

2. The heat exchanger according to claim 1, characterized in that The thickness of the substrate is H, and the depth Dp1 of the first groove relative to the second side surface of the substrate, the depth Dp2 of the second groove relative to the second side surface of the substrate and the thickness H of the substrate satisfy: Dp2<Dp1<Dp2+2.8H.

3. The heat exchanger according to claim 2, characterized in that The maximum width λ1 of the orthographic projection of the first groove on the plane where the second side surface of the substrate is located, the maximum width λ2 of the orthographic projection of the second groove on the plane where the second side surface of the substrate is located, and the depth Dp1 of the first groove relative to the second side surface of the substrate and the depth Dp2 of the second groove relative to the second side surface of the substrate satisfy: 0.2≤(λ1·Dp2) / (λ2·Dp1) ≤0.

9.

4. The heat exchanger according to claim 3, characterized in that The maximum width λ1 of the orthographic projection of the first groove on the plane where the second side surface of the substrate is located and the depth Dp1 of the first groove relative to the second side surface of the substrate satisfy the following conditions: 2.5≤λ1 / Dp1≤5; A maximum width λ2 of the orthographic projection of the second groove on the plane where the second side surface of the substrate is located and a depth Dp2 of the second groove relative to the second side surface of the substrate satisfy the following: 3.5≤λ2 / Dp2≤7.

5. The heat exchanger according to any one of claims 1 to 4, characterized in that: The heat exchange plate includes a first corner hole area, a second corner hole area and a heat exchange area. Along the length direction of the heat exchange plate, the heat exchange plate includes a first end and a second end. The first corner hole area is close to the first end of the heat exchange plate, and the second corner hole area is close to the second end of the heat exchange plate. The heat exchange area is located between the first corner hole area and the second corner hole area. A first guide area is provided between the first corner hole area and the heat exchange area, and a second guide area is provided between the second corner hole area and the heat exchange area. The heat exchange area is provided with the first protrusion, and the first guide area and / or the second guide area are provided with the second protrusion; And / or, along the width direction of the heat exchange plate, the first corner hole area is provided with a first corner hole and a second corner hole, the second corner hole area is provided with a third corner hole and a fourth corner hole, the second protrusion is provided between the first corner hole and the second corner hole, and / or, the second protrusion is provided between the third corner hole and the fourth corner hole.

6. The heat exchanger according to claim 5, characterized in that The heat exchange plate is further provided with a plurality of protrusions protruding toward a first direction, the protrusions being arranged around edges of the first corner hole and the third corner hole, the first corner hole and the third corner hole being located at the top of the protrusions, and / or the protrusions being located at the periphery of the second corner hole and the fourth corner hole, a predetermined distance being respectively formed between the protrusions and the second corner hole and the fourth corner hole, and along the width direction of the heat exchange plate, the first corner hole and the third corner hole are located on the same side of the heat exchange plate, or the first corner hole and the third corner hole are located on both sides of the heat exchange plate; The back side of the top of the first protrusion has a first flat portion, the back side of the top of the second protrusion has a second flat portion, and the back side of the top of the protrusion has a third flat portion. The width Wb1 of the first flat portion, the width Wb2 of the second flat portion, and the width Wb3 of the third flat portion satisfy: Wb1≤Wb2<Wb3.

7. The heat exchanger according to any one of claims 1 to 4, characterized in that: The first protrusion is a corrugated protrusion, and multiple corrugated protrusions are arranged along the length direction of the heat exchange plate. A first groove is provided between two adjacent corrugated protrusions. The corrugated protrusion includes multiple extension sections, and the extension sections are inclined relative to the length direction of the heat exchange plate.

8. The heat exchanger according to any one of claims 1 to 4, characterized in that: A third protrusion protruding toward the first direction is provided between at least some adjacent two first protrusions, a third groove is formed on the back surface of the third protrusion, and a height of the third protrusion relative to the first side surface of the substrate is less than a height of the first protrusion relative to the first side surface of the substrate; The first protrusion is a corrugated protrusion, and multiple corrugated protrusions are arranged along the length direction of the heat exchange plate. The corrugated protrusion includes multiple extension sections, and the extension sections are inclined relative to the length direction of the heat exchange plate. The third protrusion is a corrugated protrusion, and a second groove is provided between adjacent first protrusions and third protrusions.

9. The heat exchanger according to any one of claims 1 to 4, characterized in that: A fourth groove is provided between at least some adjacent two first protrusions, the groove being recessed away from the first direction. A fourth protrusion is formed on the back surface of the fourth groove. The height of the first protrusion relative to the first side surface of the substrate is greater than the height of the fourth protrusion relative to the second side surface of the substrate. The first protrusion is a corrugated protrusion, and multiple corrugated protrusions are arranged along the length direction of the heat exchange plate. The corrugated protrusion includes multiple extension sections, and the extension sections are inclined relative to the length direction of the heat exchange plate. The fourth protrusion is a corrugated protrusion, and the fourth protrusion is located between two adjacent first grooves.

10. The heat exchanger according to any one of claims 1 to 4, characterized in that: The heat exchange plate includes a first corner hole area, a second corner hole area and a heat exchange area. Along the length direction of the heat exchange plate, the heat exchange plate includes a first end and a second end. The first corner hole area is close to the first end of the heat exchange plate, and the second corner hole area is close to the second end of the heat exchange plate. The heat exchange area is located between the first corner hole area and the second corner hole area. The first protrusion is provided in the heat exchange area, and the first groove is a pit structure. The heat exchange area is also provided with a recessed portion, and a plurality of the first protrusions are arranged around the recessed portion.

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